Sure enough, she was right, for there close at hand was a great white object. "All aboard!" shouted a big polar bear. "Watch your step!" The mermaid helped Mary Louise to slide on a projecting ledge, and off they went. "Now we can enjoy the scenery," laughed the mermaid, as she arranged her tail in an artistic curve and brushed back her hair, which had been swept over her eyes by the swift action of the water. "The train never stops, you know, until it reaches its destination, but that need not interfere with our getting off any time we please should you wish to visit any pretty spot we pass on our journey." Just at that moment there was a tremendous crash and Mary Louise found herself thrown off into the water, while a muffled roar rolled through the depths of the ocean. The Coral Palace "Why, the ocean is full of cracked ice!" exclaimed Mary Louise, as she and the mermaid rose to the surface and looked about them. "I wonder what it was that caused such a tremendous crash?" "Perhaps the Whale Ice Trust is after a big ice supply," replied the mermaid with a laugh. "The ocean depths are no longer a quiet place since this dreadful hot weather set in. Just the other day I heard the King of the Mermen say that they were about to send a note of protest to Neptune for violating the laws of Merland!" "I don't know much about it," said Mary Louise, "except that it's very inconvenient to have one's voyage disturbed in such a way. What are we going to do now?" "How would you like to visit the Court of the Mer King?" asked the mermaid. "Oh, lovely!" cried Mary Louise. "I've never met any kinds, although I've read about them in fairy stories." "Come along then," said the mermaid. "Follow me straight down, for I think we are not very far from the Coral Palace, where King Seaphus holds court." Placing the palms of her hands together diving fashion, she gave her pretty tail a kick-off, and away she went, head downward, through the water. Mary Louise followed her example, somewhat surprised at the ease with which she executed this difficult maneuver. In a short time they found themselves on the bottom of the ocean. In the distance could be seen the dim outline of a magnificent castle of pink and white coral. Leading up to it was a wide highway, flanked on either side with beautiful sea-grass, and dotted here and there, like milestones, stood columns of beautiful coral. Banks of exquisite mother-of-pearl rose at intervals along the way; water plants of various hues grew in wild profusion. "Why, it's very much like the earth," exclaimed Mary Louise, "only one doesn't walk, and its not dusty, and--and it's not hot and sunny!" "No, indeed!" said the mermaid. "But sometimes we have a pest of water gnats that are worse than mosquitoes, and we have to put up netting on our bedroom windows to keep them out."